scholarly journals Investigating Moho depth, Curie Point, and heat flow variations of the Yozgat Batholith and its surrounding area, north central Anatolia,Turkey, using gravity and magnetic anomalies

2017 ◽  
Vol 26 ◽  
pp. 410-420 ◽  
Author(s):  
Funda BİLİM
Keyword(s):  
Heat Flow ◽  
Curie Point ◽  
Magnetic Anomalies ◽  
Central Anatolia ◽  
Moho Depth ◽  
Surrounding Area ◽  
North Central ◽  
Gravity And Magnetic ◽  
Area North ◽  
Heat Flow Variations

scholarly journals Regional estimation of Curie-point depths and succeeding geothermal parameters from recently acquired high-resolution aeromagnetic data of the entire Bida Basin, north-central Nigeria

2017 ◽  
Vol 5 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Levi I. Nwankwo ◽  
Abayomi J. Sunday
Keyword(s):  
High Resolution ◽  
Heat Flow ◽  
Curie Point ◽  
Thermal Structure ◽  
Geothermal Gradient ◽  
North Central ◽  
Geodynamic Processes ◽  
Regional Estimation ◽  
Heat Flow Variations ◽  
Geothermal Parameters

<p><strong>Abstract.</strong> A regional estimation of Curie-point depths (CPDs) and succeeding geothermal gradients and subsurface crustal heat flow has been carried out from the spectral centroid analysis of the recently acquired high-resolution aeromagnetic (HRAM) data of the entire Bida Basin in north-central Nigeria. The HRAM data were divided into 28 overlapping blocks, and each block was analysed to obtain depths to the top, centroid, and bottom of the magnetic sources. The depth values were then used to assess the CPD, geothermal gradient, and subsurface crustal heat flow in the basin. The result shows that the CPD varies between 15.57 and 29.62<span class="thinspace"></span>km with an average of 21.65<span class="thinspace"></span>km, the geothermal gradient varies between 19.58 and 37.25<span class="thinspace"></span>°C<span class="thinspace"></span>km<sup>−1</sup> with an average of 27.25<span class="thinspace"></span>°C<span class="thinspace"></span>km<sup>−1</sup>, and the crustal heat flow varies between 48.41 and 93.12<span class="thinspace"></span>mW<span class="thinspace"></span>m<sup>−2</sup> with an average of 68.80<span class="thinspace"></span>mW<span class="thinspace"></span>m<sup>−2</sup>. Geodynamic processes are mainly controlled by the thermal structure of the Earth's crust; therefore this study is important for appraisal of the geo-processes, rheology, and understanding of the heat flow variations in the Bida Basin, north-central Nigeria.</p>

Analysis of aeromagnetic measurements from the Cascade Range in central Oregon

Geophysics ◽  
1983 ◽  
Vol 48 (3) ◽  
pp. 376-390 ◽  
Author(s):  
G. Connard ◽  
R. Couch ◽  
M. Gemperle
Keyword(s):  
Heat Flow ◽  
Curie Point ◽  
Hot Springs ◽  
Magnetic Anomalies ◽  
High Heat ◽  
Cascade Range ◽  
Thermal Gradients ◽  
Tectonic Structures ◽  
Basin And Range Province ◽  
Lateral Offset

Shallow Curie‐point isotherm depths, indicated by the analysis of magnetic anomalies, young silicic volcanism, hot springs, and high heat flow mark the Cascade Range of central Oregon as a potentially important geothermal resource area. Aeromagnetic measurements in the central Cascades between 43°00′ and 44°15′N latitude and 121°00′ and 122°30′W longitude exhibit predominant northwest‐southeast lineations and less prominent north‐northeast by south‐southeast lineations. Longer wavelength components of the magnetic anomalies (greater than 25 km), possibly related to deeper sources, trend approximately north‐south parallel to the Cascade Range. Magnetic anomalies show a right‐lateral offset of the High Cascades Volcanism at 43°30′N latitude, which is consistent with the tectonic structures of the Basin and Range province southeast of the area. Magnetic source depth calculations show that the High Cascades occupy a structural depression or graben on the eastern side of the Western Cascades. Spectral analysis of the magnetic anomalies suggests that the High Cascades are underlain by Curie‐point isotherm depths as shallow as 9 km. These shallow Curie‐point isotherm depths imply thermal gradients greater than 50°C/km and surface heat flow greater than [Formula: see text].

scholarly journals Assessment of Gas Hydrate Resources in Ross Sea Area, Antarctica Based on Inversion of Gravity and Magnetic Data

2021 ◽  
Author(s):  
wei Wang ◽  
meng Wan ◽  
miaojun Sun ◽  
weijie Jiang ◽  
ping Xu
Keyword(s):  
Heat Flow ◽  
High Precision ◽  
Gas Hydrate ◽  
Ross Sea ◽  
Magnetic Data ◽  
Moho Depth ◽  
Gravity And Magnetic ◽  
Curie Depth ◽  
Sea Area ◽  
Gravity And Magnetic Data

Abstract The Ross Sea is located between Victoria Land and Mary Bird Land in West Antarctica. In this paper, the published gravity and magnetic data in the Ross Sea area are fused with the high-precision gravity and magnetic data measured by the ship. Then, The gravity anomaly data is used to invert the Moho depth by the Parker-Oldenburg method; the magnetic anomaly data is used to invert the Curie depth of the Ross Sea area by the power spectrum method. Finally, according to the inversion results of the Moho depth and Curie depth, the high-precision heat flow distribution in the Ross Sea area is calculated. And compared with the actual measured heat flow value and other inversion results, it shows that this inversion result has obtained a higher resolution. At the same time, the geothermal gradient is calculated by heat flow and thermal conductivity. According to the temperature-pressure equation for formation and storage of gas hydrate, the thickness of the gas hydrate stability zone in the study area was quantitatively calculated.

scholarly journals INTERPRETATION OF AEROMAGNETIC DATA AND LANDSAT IMAGERY OVER THE NIGERIAN YOUNGER GRANITES IN AND AROUND KAFANCHAN AREA, NORTH-CENTRAL NIGERIA

2021 ◽  
Vol 4 (4) ◽  
pp. 323-333
Author(s):  
S. Mustapha ◽  
S. Suleman ◽  
S. R. Iliyasu ◽  
E. E. Udensi ◽  
Y. A. Sanusi ◽  
...  
Keyword(s):  
Landsat Imagery ◽  
Magnetic Anomalies ◽  
Biotite Granite ◽  
Aeromagnetic Data ◽  
North Central ◽  
The North ◽  
Area North ◽  
First Vertical Derivative ◽  
Basic Igneous Rock ◽  
Western Half

In this research the lineaments of the Kafanchan area in North-central Nigeria were investigated in order to explore the mineralization zones of the area. Aeromagnetic data over Kafanchan and environs within the Younger Granite Province, in the North-Central Nigeria were collated and analyzed. The aeromagnetic map of the area was interpreted both qualitatively and quantitatively so as to identify the nature of the magnetic sources and the trends direction in the study area. The trend of the Total Magnetic Intensity (TMI) map is predominantly in NE-SW. The First Vertical Derivative (FVD) Lineaments Map was also correlated with LADSAT lineaments map and both maps agreed in most areas. The study area is characterized by predominant magnetic lineament trend in NE-SW direction and subordinate E-W direction. The result also shows that the most significant structural trends affecting the distribution of these magnetic anomalies in the study area is in NE-SW direction. The TMI map indicates that there are three major mineralization zones in the study area. The high magnetization contrast in the NE and SE parts of the study area correlates with the migmatite-gneiss, biotite-granites, granites and basalts which are associated with high magnetic contrasts. Also, the high magnetization contrast in the NW part of the area correlates with basalt and the biotite-granite. However, the predominant low magnetization contrast observed in the western half does not correlate with the basic igneous rock

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